Ultra-realistic 3D Depiction of a Coastal Metropolis

Generate an ultra-realistic 3D depiction of a coastal metropolis located on a verdant island for use in a city simulation game. Illustrate a lively downtown area with an orderly street grid bustling with vehicles and pedestrians immersed in their daily routines. Include intricately detailed skyscrapers, a city hall, police and fire department buildings, along with a busy harbor featuring ships and freight containers. Present the scene under bright midday sunlight, accentuating precise building designs and textures paired with lifelike lighting effects. Add tropical greenery, such as palm trees, alongside parks with fountains and walking paths. Render the perspective in isometric projection for maximum clarity.